Our Physician Partners
We have one the most robust physician networks in the Region, with specialists known around the country and the world for quality and the innovative care they provide.
Mark S. Tuttle, MD, is a fellowship-trained, board-certified orthopedic surgeon specializing in hip and knee replacement, joint replacement revision, fracture care, and general orthopedics, with special interest in direct anterior total hip arthroplasty and minimally invasive total joint replacement. Dr. Tuttle received his medical degree in 2001 from the University of New Mexico School of Medicine in Albuquerque, where he was valedictorian of his graduating class. Dr. Tuttle also received the faculty award for Outstanding Graduating Medical Student. Upon graduation, Dr. Tuttle completed his orthopedic surgery residency at the University of Colorado Health Sciences Center in Aurora, Colo., where he earned the Outstanding Resident Research Award. Following his residency, he also completed a fellowship in adult reconstruction at the University of Colorado. Dr. Tuttle is a member of the International Congress for Joint Reconstruction, an organization that focuses on orthopedic education. He has co-authored multiple scientific publications and presentations, including research on femoral shaft fractures in multiple-injury patients. Dr. Tuttle is a Diplomat of the American Board of Orthopaedic Surgery, is a member of the American Academy of Orthopaedic Surgeons, and is a member of the American Association of Hip and Knee Surgeons. Learn more.
DR. Mark Tuttle
Hip and Knee Replacement/Anterior Hip Expert
Mark S. Tuttle, MD, is a fellowship-trained, board-certified orthopedic surgeon specializing in hip and knee replacement, joint replacement revision, fracture care, and general orthopedics, with special interest in direct anterior total hip arthroplasty and minimally invasive total joint replacement. Dr. Tuttle received his medical degree in 2001 from the University of New Mexico School of Medicine in Albuquerque, where he was valedictorian of his graduating class.
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Dr. Tuttle also received the faculty award for Outstanding Graduating Medical Student. Upon graduation, Dr. Tuttle completed his orthopedic surgery residency at the University of Colorado Health Sciences Center in Aurora, Colo., where he earned the Outstanding Resident Research Award. Following his residency, he also completed a fellowship in adult reconstruction at the University of Colorado. Dr. Tuttle is a member of the International Congress for Joint Reconstruction, an organization that focuses on orthopedic education. He has co-authored multiple scientific publications and presentations, including research on femoral shaft fractures in multiple-injury patients. Dr. Tuttle is a Diplomat of the American Board of Orthopaedic Surgery, is a member of the American Academy of Orthopaedic Surgeons, and is a member of the American Association of Hip and Knee Surgeons. Learn more.
Mark S. Tuttle, MD, is a fellowship-trained, board-certified orthopedic surgeon specializing in hip and knee replacement, joint replacement revision, fracture care, and general orthopedics, with special interest in direct anterior total hip arthroplasty and minimally invasive total joint replacement. Dr. Tuttle received his medical degree in 2001 from the University of New Mexico School of Medicine in Albuquerque, where he was valedictorian of his graduating class. Dr. Tuttle also received the faculty award for Outstanding Graduating Medical Student. Upon graduation, Dr. Tuttle completed his orthopedic surgery residency at the University of Colorado Health Sciences Center in Aurora, Colo., where he earned the Outstanding Resident Research Award. Following his residency, he also completed a fellowship in adult reconstruction at the University of Colorado. Dr. Tuttle is a member of the International Congress for Joint Reconstruction, an organization that focuses on orthopedic education. He has co-authored multiple scientific publications and presentations, including research on femoral shaft fractures in multiple-injury patients. Dr. Tuttle is a Diplomat of the American Board of Orthopaedic Surgery, is a member of the American Academy of Orthopaedic Surgeons, and is a member of the American Association of Hip and Knee Surgeons. Learn more.
DR. Daniel C. allison
Oncology Complex Hip and Knee Reconstruction
Daniel C. Allison, MD, FACS, is board certified in orthopedic surgery with expertise in musculoskeletal oncology, complex hip and knee joint reconstruction, and anterior hip replacement. He is Assistant Director of Orthopedic Oncology at Cedars-Sinai Medical Center, Associate Clinical Professor of Orthopedic Surgery at University of Southern California, and Co-Director of Pediatric Orthopedic Oncology at Children’s Hospital of Los Angeles (CHLA).
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Dr. Allison is a Fellow of the American College of Surgeons (FACS) and the American Academy of Orthopedic Surgeons (AAOS). He is also a member of the Musculoskeletal Tumor Society (MSTS), the Orthopedic Trauma Association (OTA), the American Association of Hip and Knee Surgeons (AAHKS), and the American Orthopedic Association (AOA). Learn more.
Dr. Ron Hillock
Oncology Complex Hip and Knee Reconstruction
Dr. Hillock is focused on the diagnosis and treatment of musculoskeletal disease and adult joint reconstruction surgery. Dr. Hillock currently serves as Chief of Surgery at Centennial Hills Hospital and Medical Center in Las Vegas and on the Board of Directors of the Nevada State Orthopedic Society. Dr. Hillock received his Bachelor of Science degree in Biology from the University of California, Riverside. He received his Doctor of Medicine degree from Loma Linda University in California.
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He then completed his orthopedic surgery residency at Texas Tech University Health Science Center in El Paso. Dr. Hillock completed his fellowship in orthopedic oncology at the University of California, Los Angeles, School of Medicine in Santa Monica. Dr. Hillock has served as the Chief of Surgery for the 67th Combat Support Hospital during Operation Iraqi Freedom and Chief of Orthopedic Surgery Rehabilitation Service at the U.S. Army Hospital in Heidelberg, Germany. Learn more.
DR. Earl Brien
Oncology Complex Hip and Knee Reconstruction
Dr. Brien earned a bachelor’s degree from the University of California at Berkeley and a medical degree from Howard University School of Medicine, Washington, DC. He completed an internship in general surgery at St. Luke’s-Roosevelt Hospital, Columbia University, New York City, and a residency in orthopedic surgery at King/Drew School of Medicine, Los Angeles. Thereafter he completed a fellowship in orthopedic oncology at the Sloan-Kettering Cancer Center in New York City.
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From 1993-2004, he served as Director of Musculoskeletal Tumor Service at the Orthopedic Hospital in Los Angeles. From 2004 – 2007 he served as Fellowship Coordinator, Sarcoma Service, John Wayne Cancer Institute / St. John Health Center, Santa Monica, CA. Since 2008, he has served as Surgical Director, Sarcoma Service at Cedars-Sinai Medical Center in Los Angeles. Learn more.
DR. David So
Hip and Knee Replacement
Dr. David So is an orthopedic surgeon in Orange, CA. He earned his medical degree from Wayne State University and then completed his internship and residency training, both in orthopedic surgery at the Henry Ford Hospital. Later, he completed his fellowship at the University of Pennsylvania in adult reconstruction. Currently, Dr. So is affiliated with UCI Health Orthopedic Surgery Services and the UCI Health Orthopedic & Sports Medicine Center. He specializes in joint replacements of the knee and hip as well as other orthopedic procedures. Learn more.
DR. Lindsey Rolston
Knee Replacement
Dr. Lindsey Rolston’s surgical expertise has led him to develop new and better ways to perform knee implants. He pioneered the development of a bicompartmental knee for which he holds a patent. He also has played an important role in the development of four other knee implant systems. Dr. Rolston is a board-certified orthopedic surgeon. He received his undergraduate from Bradley University and MD degree from the University of Illinois and completed his orthopedic residency at Michigan State University, Kalamazoo, where he was also the Chief Orthopedic Resident.
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He is a member of the following societies: Indiana Orthopedic Society, American Academy of Orthopedic Surgeons, Indiana State Medical Society and American Association of Hip and Knee Surgeons, and Bradley University Centurion Society. Learn more.
Dr. Afshin Masoof
Total Joint Replacement Sports Medicine
Dr. Afshin Mashoof grew up locally in Southern California. He completed an undergraduate degree in Engineering before focusing his attention to a career in medicine. At Creighton University School of Medicine, he was awarded multiple awards including a research scholarship for work on bone healing and cartilage regeneration. He then continued his training in orthopedic surgery at Kingsbrook/Beth Israel Medical Center in New York City where he trained with the leading surgeons in the country.
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Dr. Mashoof has over 20 years of experience in treating a variety of orthopedic and sports-related injuries and problems. He has extensive expertise in arthroscopic and minimally invasive reconstructive (Total joint replacement) of the knee/shoulder/Hip, including ligament/tendon injuries, cartilage regeneration and arthritis. Learn more.
DR. Craig Tingey
Total Joint Replacement Sports Medicine
Dr. Craig Tingey specializes in sports medicine and arthroscopic surgery, as well as total joint replacement surgery of the knee, hip, and shoulder. He is skilled in the latest surgical techniques including arthroscopic rotator cuff repairs and minimally invasive hip and knee replacement surgery. He was also part of the orthopedic trauma group that provides care for patients with orthopedic injuries at the University Medical Center, a Level 1 Trauma center. Dr. Tingey served as the chief of orthopedic surgery at Mountain View Hospital.
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Dr. Tingey earned his Bachelor of Science from Brigham Young University, followed by his Doctor of Medicine from Wake Forest University in North Carolina. He completed his surgical internship and orthopedic surgical residency at Loma Linda University School of Medicine in Southern California where, as chief resident, he was awarded the Leonard Marmor Award for "Excellence in Orthopedic Surgery," as well as multiple awards for his medical research. Learn more.
Dr. Brian Moss
Total Joint Replacement Sports Medicine
Dr. Brian Moss joined Orthopedic Associates after completing his Orthopedic Sports Medicine fellowship in San Diego. During fellowship, Dr. Moss worked with a wide variety of elite athletes in sports ranging from NFL football, to WWE wrestling, professional rodeo, MMA, rugby, and skate boarding. He completed his residency at Michigan State University where he was exposed to a wide range of orthopedic surgical cases. He enjoys the variety of general orthopedic surgery but has special interest in sports medicine procedures including knee and shoulder arthroscopic reconstruction and repair. He enjoys trauma procedures and additionally specializes in knee and shoulder arthroplasty. Learn more.
Dr. Jay Patel
Total Joint
Board-Certified Orthopedic Surgeon
Dr. Patel is a board-certified orthopedic surgeon specializing in Total Joint Replacement and Adult Reconstructive Surgery. Dr. Patel is an attending surgeon at both Hoag Orthopaedic Institute in Irvine as well as St. Joseph’s Hospital in Orange. His area of expertise includes both primary and revision surgical procedures of the hip and knee. He also brings expertise in new surgical techniques including minimally invasive surgical procedures, anterior approach hip replacement surgery, computer navigation, as well as robotic joint replacement.
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Dr. Patel is an active member of the American Academy of Orthopaedic Surgeons and the American Association of Hip and Knee Surgeons. He has published on multiple areas of orthopedic research, including computer navigation systems for total joint replacement, revision of complex hip and knee replacement surgery, and orthopedic clinical outcomes. Dr. Patel enjoys spending time with his wife and young children as well as cycling, hiking, and skiing. Learn more.
Dr. Benjamin Sears
Advanced Shoulder & Elbow Surgery
A Colorado native, Dr. Benjamin Sears received his Bachelor of Science degree in Zoology from Colorado State University in Fort Collins. He then went on to earn a Master of Science degree in Pharmacology from Tulane University in New Orleans, LA. In 2005, he graduated from Loyola University Medical School in Chicago, earning his Doctor of Medicine degree and graduating in the top third of his class.
Dr. Sears stayed at Loyola University to complete his surgical residency in Orthopaedics. At Loyola, Dr. Sears received formal training in surgical treatments of hand, hip, knee, and sports injuries while developing an interest in advanced shoulder and elbow surgery.
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Following his residency, Dr. Sears was selected to receive advanced training in shoulder and elbow surgery at the prestigious Rothman Institute of Thomas Jefferson University Hospital, in Philadelphia,
Dr. Sears subsequently completed two observational fellowships with some of the most renowned elbow surgeons in the world: Drs. Bernard Morrey and Joaquin Sanchez-Sotelo at the Mayo Clinic in Rochester, MN, and Dr. Graham King at the McFarlane Hand and Upper Limb Centre, Ontario, Canada. This additional training provided Dr. Sears advanced skill in all aspects of elbow surgery, from complex fractures and dislocations to elbow arthroscopy, to advanced reconstructive procedures including total elbow replacement and biologic interpositional arthroplasty. Learn more.
Dr. Ryan Car
Board-Certified, Dual-Fellowship-Trained Orthopedic Surgeon
Dr. Ryan Carr is a board-certified, dual-fellowship-trained orthopedic surgeon who specializes in disorders of the shoulder, hip, and knee. Procedures he performs include joint replacements, advanced arthroscopic reconstruction surgery, and fracture management.
Dr. Carr received his medical degree from Chicago Medical School and completed his surgical residency in the Department of Orthopedic Surgery at the University of Illinois. He has trained with one of the most regarded shoulder surgeons in the country.
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Prior to practicing in Denver, he was team physician for both professional and high school sports teams. In 2014, Dr. Carr was awarded the “Vernon L. Nickel Research Award” from the Orthopedic Research Association. When he is not in the office, he enjoys skiing, mountain biking, and spending time with his wife, daughter Stella, and a Great Dane. Learn more.